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164 lines
4.5 KiB
164 lines
4.5 KiB
package crypto
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import (
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"crypto/subtle"
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secp256k1 "github.com/btcsuite/btcd/btcec"
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"github.com/tendermint/ed25519"
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"github.com/tendermint/ed25519/extra25519"
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)
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func PrivKeyFromBytes(privKeyBytes []byte) (privKey PrivKey, err error) {
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err = cdc.UnmarshalBinaryBare(privKeyBytes, &privKey)
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return
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}
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//----------------------------------------
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type PrivKey interface {
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Bytes() []byte
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Sign(msg []byte) (Signature, error)
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PubKey() PubKey
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Equals(PrivKey) bool
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}
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//-------------------------------------
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var _ PrivKey = PrivKeyEd25519{}
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// Implements PrivKey
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type PrivKeyEd25519 [64]byte
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func (privKey PrivKeyEd25519) Bytes() []byte {
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return cdc.MustMarshalBinaryBare(privKey)
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}
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func (privKey PrivKeyEd25519) Sign(msg []byte) (Signature, error) {
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privKeyBytes := [64]byte(privKey)
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signatureBytes := ed25519.Sign(&privKeyBytes, msg)
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return SignatureEd25519(*signatureBytes), nil
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}
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func (privKey PrivKeyEd25519) PubKey() PubKey {
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privKeyBytes := [64]byte(privKey)
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pubBytes := *ed25519.MakePublicKey(&privKeyBytes)
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return PubKeyEd25519(pubBytes)
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}
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// Equals - you probably don't need to use this.
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// Runs in constant time based on length of the keys.
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func (privKey PrivKeyEd25519) Equals(other PrivKey) bool {
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if otherEd, ok := other.(PrivKeyEd25519); ok {
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return subtle.ConstantTimeCompare(privKey[:], otherEd[:]) == 1
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} else {
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return false
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}
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}
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func (privKey PrivKeyEd25519) ToCurve25519() *[32]byte {
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keyCurve25519 := new([32]byte)
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privKeyBytes := [64]byte(privKey)
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extra25519.PrivateKeyToCurve25519(keyCurve25519, &privKeyBytes)
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return keyCurve25519
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}
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// Deterministically generates new priv-key bytes from key.
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func (privKey PrivKeyEd25519) Generate(index int) PrivKeyEd25519 {
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bz, err := cdc.MarshalBinaryBare(struct {
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PrivKey [64]byte
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Index int
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}{privKey, index})
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if err != nil {
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panic(err)
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}
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newBytes := Sha256(bz)
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newKey := new([64]byte)
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copy(newKey[:32], newBytes)
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ed25519.MakePublicKey(newKey)
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return PrivKeyEd25519(*newKey)
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}
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func GenPrivKeyEd25519() PrivKeyEd25519 {
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privKeyBytes := new([64]byte)
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copy(privKeyBytes[:32], CRandBytes(32))
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ed25519.MakePublicKey(privKeyBytes)
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return PrivKeyEd25519(*privKeyBytes)
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}
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// NOTE: secret should be the output of a KDF like bcrypt,
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// if it's derived from user input.
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func GenPrivKeyEd25519FromSecret(secret []byte) PrivKeyEd25519 {
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privKey32 := Sha256(secret) // Not Ripemd160 because we want 32 bytes.
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privKeyBytes := new([64]byte)
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copy(privKeyBytes[:32], privKey32)
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ed25519.MakePublicKey(privKeyBytes)
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return PrivKeyEd25519(*privKeyBytes)
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}
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//-------------------------------------
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var _ PrivKey = PrivKeySecp256k1{}
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// Implements PrivKey
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type PrivKeySecp256k1 [32]byte
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func (privKey PrivKeySecp256k1) Bytes() []byte {
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return cdc.MustMarshalBinaryBare(privKey)
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}
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func (privKey PrivKeySecp256k1) Sign(msg []byte) (Signature, error) {
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priv__, _ := secp256k1.PrivKeyFromBytes(secp256k1.S256(), privKey[:])
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sig__, err := priv__.Sign(Sha256(msg))
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if err != nil {
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return nil, err
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}
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return SignatureSecp256k1(sig__.Serialize()), nil
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}
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func (privKey PrivKeySecp256k1) PubKey() PubKey {
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_, pub__ := secp256k1.PrivKeyFromBytes(secp256k1.S256(), privKey[:])
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var pub PubKeySecp256k1
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copy(pub[:], pub__.SerializeCompressed())
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return pub
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}
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// Equals - you probably don't need to use this.
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// Runs in constant time based on length of the keys.
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func (privKey PrivKeySecp256k1) Equals(other PrivKey) bool {
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if otherSecp, ok := other.(PrivKeySecp256k1); ok {
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return subtle.ConstantTimeCompare(privKey[:], otherSecp[:]) == 1
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} else {
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return false
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}
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}
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/*
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// Deterministically generates new priv-key bytes from key.
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func (key PrivKeySecp256k1) Generate(index int) PrivKeySecp256k1 {
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newBytes := cdc.BinarySha256(struct {
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PrivKey [64]byte
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Index int
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}{key, index})
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var newKey [64]byte
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copy(newKey[:], newBytes)
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return PrivKeySecp256k1(newKey)
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}
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*/
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func GenPrivKeySecp256k1() PrivKeySecp256k1 {
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privKeyBytes := [32]byte{}
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copy(privKeyBytes[:], CRandBytes(32))
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priv, _ := secp256k1.PrivKeyFromBytes(secp256k1.S256(), privKeyBytes[:])
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copy(privKeyBytes[:], priv.Serialize())
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return PrivKeySecp256k1(privKeyBytes)
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}
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// NOTE: secret should be the output of a KDF like bcrypt,
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// if it's derived from user input.
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func GenPrivKeySecp256k1FromSecret(secret []byte) PrivKeySecp256k1 {
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privKey32 := Sha256(secret) // Not Ripemd160 because we want 32 bytes.
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priv, _ := secp256k1.PrivKeyFromBytes(secp256k1.S256(), privKey32)
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privKeyBytes := [32]byte{}
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copy(privKeyBytes[:], priv.Serialize())
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return PrivKeySecp256k1(privKeyBytes)
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}
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